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- Title
大跨度斜拉桥超长拉索多模态振动阻尼协同 控制技术研究.
- Authors
柴小鹏; 查道宏; 汪正兴; 赵海威; 盛能军
- Abstract
The Shanghai - Suzhou - Nantong Yangtze River Bridge is the world's largest rail-cum-road cable-stayed bridge and its vibration mode of super-long and super-heavy stay cable is complex and the vibration control is difficult. Through theoretical analysis and field measurement, the multi-mode vibration control method and technology for super-long stay cable of long-span cable-stayed bridge are obtained. The research shows that the measured vibration of super-long stay cable during construction has multi-modal characteristics, including low-order vibration (5~15 orders ) and high-order vibration (46~ 50 orders ). The collaborative control analysis method of external lever mass damper ELMD and pendulum MTMD damper is proposed. The theoretical analysis results meet the requirements of multi-mode control of stay cables, and the effective vibration control range is increased to 60 orders. The newly developed ELMD damper provides additional damping and additional inertial action for the stay cable through lever amplification and gear amplification. The measured logarithmic damping rate δ≥3%. The MTMD damper is developed with pendulumtype structure, the high-order vibration reduction of the stay cable is realized by the mass tuning effect and there is no visible vibration in the field. The long-term health monitoring system shows that the maximum vibration acceleration monitored during the transit of Typhoon In-Fa is 0. 012g, and the vibration acceleration of stay cables is basically controlled below 0. 01g during the normal service of the bridge.
- Publication
Railway Standard Design, 2024, Vol 68, Issue 4, p95
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202209160011